Love this as an alternative to plastic ziplocs.

Trying to use them in the freezer to store berries for smoothies. Very difficult to close. And when I think it is finally sealed, one side pops open. I close that and the other side pops open. Frustrating. They are more economical than another brand so was hoping to switch, but they don't stay closed for me.

I am very happy with Durbl products. I will be a repeat customer.

They are very sturdy, made out of quite thick silicone with solid seams. They do taper quite a bit towards the top so if you want to fill them with bulky foods (I use them for muffins) bear that in mind. They are also not flexible around the edge whuch makes them sturdy but also less forgiving of being shoved into a crowded freezer. The seal has held well on my bags so far, no burn on foods held short-term.

This size works well for a loaf of bakery bread